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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
*/
package manager
import (
"log"
"strings"
"unsafe"
"golang.org/x/sys/windows"
"golang.org/x/sys/windows/svc/mgr"
)
func checkForPitfalls() {
go func() {
pitfallDnsCacheDisabled()
pitfallVirtioNetworkDriver()
}()
}
func pitfallDnsCacheDisabled() {
scm, err := mgr.Connect()
if err != nil {
return
}
defer scm.Disconnect()
svc := mgr.Service{Name: "dnscache"}
svc.Handle, err = windows.OpenService(scm.Handle, windows.StringToUTF16Ptr(svc.Name), windows.SERVICE_QUERY_CONFIG)
if err != nil {
return
}
defer svc.Close()
cfg, err := svc.Config()
if err != nil {
return
}
if cfg.StartType != mgr.StartDisabled {
return
}
log.Printf("Warning: the %q (dnscache) service is disabled; please re-enable it", cfg.DisplayName)
}
func pitfallVirtioNetworkDriver() {
var modules []windows.RTL_PROCESS_MODULE_INFORMATION
for bufferSize := uint32(128 * 1024); ; {
moduleBuffer := make([]byte, bufferSize)
err := windows.NtQuerySystemInformation(windows.SystemModuleInformation, unsafe.Pointer(&moduleBuffer[0]), bufferSize, &bufferSize)
switch err {
case windows.STATUS_INFO_LENGTH_MISMATCH:
continue
case nil:
break
default:
return
}
mods := (*windows.RTL_PROCESS_MODULES)(unsafe.Pointer(&moduleBuffer[0]))
modules = unsafe.Slice(&mods.Modules[0], mods.NumberOfModules)
break
}
for i := range modules {
if !strings.EqualFold(windows.ByteSliceToString(modules[i].FullPathName[modules[i].OffsetToFileName:]), "netkvm.sys") {
continue
}
driverPath := `\\?\GLOBALROOT` + windows.ByteSliceToString(modules[i].FullPathName[:])
var zero windows.Handle
infoSize, err := windows.GetFileVersionInfoSize(driverPath, &zero)
if err != nil {
return
}
versionInfo := make([]byte, infoSize)
err = windows.GetFileVersionInfo(driverPath, 0, infoSize, unsafe.Pointer(&versionInfo[0]))
if err != nil {
return
}
var fixedInfo *windows.VS_FIXEDFILEINFO
fixedInfoLen := uint32(unsafe.Sizeof(*fixedInfo))
err = windows.VerQueryValue(unsafe.Pointer(&versionInfo[0]), `\`, unsafe.Pointer(&fixedInfo), &fixedInfoLen)
if err != nil {
return
}
const minimumPlausibleVersion = 40 << 48
const minimumGoodVersion = (100 << 48) | (85 << 32) | (104 << 16) | (20800 << 0)
version := (uint64(fixedInfo.FileVersionMS) << 32) | uint64(fixedInfo.FileVersionLS)
if version >= minimumGoodVersion || version < minimumPlausibleVersion {
return
}
log.Println("Warning: the VirtIO network driver (NetKVM) is out of date and may cause known problems; please update to v100.85.104.20800 or later")
return
}
}
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